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FilmShader.js

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+/**
+ * @author alteredq / http://alteredqualia.com/
+ *
+ * Film grain & scanlines shader
+ *
+ * - ported from HLSL to WebGL / GLSL
+ * http://www.truevision3d.com/forums/showcase/staticnoise_colorblackwhite_scanline_shaders-t18698.0.html
+ *
+ * Screen Space Static Postprocessor
+ *
+ * Produces an analogue noise overlay similar to a film grain / TV static
+ *
+ * Original implementation and noise algorithm
+ * Pat 'Hawthorne' Shearon
+ *
+ * Optimized scanlines + noise version with intensity scaling
+ * Georg 'Leviathan' Steinrohder
+ *
+ * This version is provided under a Creative Commons Attribution 3.0 License
+ * http://creativecommons.org/licenses/by/3.0/
+ */
+
+THREE.FilmShader = {
+
+	uniforms: {
+
+		"tDiffuse":   { type: "t", value: null },
+		"time":       { type: "f", value: 0.0 },
+		"nIntensity": { type: "f", value: 0.5 },
+		"sIntensity": { type: "f", value: 0.05 },
+		"sCount":     { type: "f", value: 4096 },
+		"grayscale":  { type: "i", value: 1 }
+
+	},
+
+	vertexShader: [
+
+		"varying vec2 vUv;",
+
+		"void main() {",
+
+			"vUv = uv;",
+			"gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );",
+
+		"}"
+
+	].join("\n"),
+
+	fragmentShader: [
+
+		// control parameter
+		"uniform float time;",
+
+		"uniform bool grayscale;",
+
+		// noise effect intensity value (0 = no effect, 1 = full effect)
+		"uniform float nIntensity;",
+
+		// scanlines effect intensity value (0 = no effect, 1 = full effect)
+		"uniform float sIntensity;",
+
+		// scanlines effect count value (0 = no effect, 4096 = full effect)
+		"uniform float sCount;",
+
+		"uniform sampler2D tDiffuse;",
+
+		"varying vec2 vUv;",
+
+		"void main() {",
+
+			// sample the source
+			"vec4 cTextureScreen = texture2D( tDiffuse, vUv );",
+
+			// make some noise
+			"float x = vUv.x * vUv.y * time *  1000.0;",
+			"x = mod( x, 13.0 ) * mod( x, 123.0 );",
+			"float dx = mod( x, 0.01 );",
+
+			// add noise
+			"vec3 cResult = cTextureScreen.rgb + cTextureScreen.rgb * clamp( 0.1 + dx * 100.0, 0.0, 1.0 );",
+
+			// get us a sine and cosine
+			"vec2 sc = vec2( sin( vUv.y * sCount ), cos( vUv.y * sCount ) );",
+
+			// add scanlines
+			"cResult += cTextureScreen.rgb * vec3( sc.x, sc.y, sc.x ) * sIntensity;",
+
+			// interpolate between source and result by intensity
+			"cResult = cTextureScreen.rgb + clamp( nIntensity, 0.0,1.0 ) * ( cResult - cTextureScreen.rgb );",
+
+			// convert to grayscale if desired
+			"if( grayscale ) {",
+
+				"cResult = vec3( cResult.r * 0.3 + cResult.g * 0.59 + cResult.b * 0.11 );",
+
+			"}",
+
+			"gl_FragColor =  vec4( cResult, cTextureScreen.a );",
+
+		"}"
+
+	].join("\n")
+
+};